Different web browsers, and different versions of web browsers, will often treat the same JavaScript slightly differently. This will be more of an issue the more complex your JavaScript becomes. Try to keep your JavaScript standard, try to test on a wide variety of browsers and versions, and make sure your web pages work if your viewers end up having to turn JavaScript off to bypass inadvertent bugs in your JavaScript. Remember that just because your code works now, there is no guarantee that it will work with tomorrow’s browsers. Keep things simple, and especially try not to “take advantage” of bugs in a browser’s JavaScript implementation. Someday that bug will probably get fixed.
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